Propeller.



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GRIGORY KO'iAll'aEVfGH,` OF SOUTH PORTLAND, OREGON.

T all whom itmag/ concern:

Be it known that I, G'RIGORY KovALnvroH,

a subject of the Emperor of Russia, `residing at South Portland, `in the county of` Multnomah, State of Oregon, have invented` certain new and useful IImprovements in Propellers, of which the following is a description, reference being hadto the accompanying drawings, forming a part thereof.;

My invention relates to screw propellers and has for its objects to provide a propeller which will be simple and inexpensive in construction and at the same timebe `highly eilicient and free from the difficulties which are experienced in` propeller wheels as usually constructed. e

Withthese and other objects hereinafter explained my invention consists in the construction and combination of elements hereinafter described and particularly pointed out in the claims.

Referring to the drawings Figure 1 is an elevation of the front end of the propeller embodying my invention. Fig.,2 is a front elevation of one ofthe blades `of the propeller shown in Fig. 1 with its connections to the shaft. Fig. Seis a. side view of the blade and connections shown in Fig. 2 taken from the `rear of Fig.`2 and Fig.` 4i is a detail view showing the connection of the stays to` the shaft.

In the drawings 1 indicates a central shaft l here shown as hollow but which maybe of any desired construction.

2 indicates a `blade extending from front to rear of the propeller and extending 3inward from the outer `periphery a distance which in the propeller shown is substantially less or greater number may be used, and in the propeller shown the outer edges of the blades may rest against and be secured to a rim which may or maynot be used. The blades are, of course, arranged at an angle to the axis of the propeller as is usual in screw propellers. The` leading edges 4 of the blades are so arranged that they will each lie in the plane of a radius as shown when viewed from the front as shown inFig. 1

Specification. of LettersPatent.

PROPELLER.

i Patented Auf". 4, 1914.

AppIication filed January 22, 1914. Serial `Nol 813,743.

and they are also so cut olf `that `the lines `of their edges when viewed from the side will .lie in the plane of a radius.

Each of the blades is secured in position by stavs here shown as four in number three of which, indicated by 5, 6 and 8 `are secured at their outer ends to the rear faceof the blade and the other, indicated by 7,` is secured to the trailing edge of the front or cutting face of the blade. The stays are all secured at their inner ends to the shaft 1 as hereinafter described. The stay 5 is secured at its outer end by rivet 9 or other jconvenientmeans tothe blade 2 near its leadingedge and near its outer edge. The

stay s formed of a flat strip and its outer portion 10, is arranged to lie against the `rear face of the blade. The portion 11 of this stay between the` inner edge of the blade and the shaft l is so twisted that the `inner end of the stay is in line with `the axis of the shaft.` The inner end of this stay is `upset 4or bent to form an inwardlyextend-` ing lug 12 which ts in a recess 13 formed in the periphery of the shaft 1, this recess 13 being so formed that the outer edge` of the stay at its inner end will be flush with the peripheral surface of the shaft. A bolt or` screw 14 near the inner end of the stayv holds it to the shaft, the head of this bolt or screw being countersunk into the outer sur-` face of the stay so as to present no obstruc tion. The stay 7 is secured to the front face of the blade near its trailing edge by a rivet or other fastening device 15. The outer portion 16 of this stay is arranged to lie against the face of the blade and the shaft and is so twisted that its inner end will be in line with the axis. 4This stay is provided at its inner end with a lug 12', as above described in connection with stay `5 and is secured in a` recess 13 as also above described inconnection with `stay 5. The recesses 13 and 13 in which the ends of stay 5 and 8, are so arranged that they are diametricallyopposite on the periphery of the shaft 1. But while the stay 5 is arranged `as shown in Fig. 3 so as to extend inward oblique angle to the axis of the shaft as shown in Fig. 3 and the recess 13 in which its' end is formed at anoblique angle to the axis. i

Stay 6is secured at its outer end to the rear face of the blade near its trailing `edge 182 in whicliitsend 12 is securedis also Y `outer portion 22 of this stay liesagainst the` g that stays 5. and being united at the outer end of stay 6 and having their inner ends.

. inner endsare widely .separated in the vdirection'of the axis of the shaft as shown inl f rear face of the blade ynear its rear end by Ydevice which secures the outer end of stay 8 or plate metal and by vthe construction between the inner edge" of the blade 'and the-v shaft is so twisted that its inner .end is' in line with the axis. This stay'instead of ex. tendinginward at rightA angles to the axis'` of the shaft extends inward and forwardaty an angle oblique to the axis yand' the recess arranged at an angle oblique to the axis.

Stay 8 is secured at its youter end to the rivet or other fastening device 21. The

rear face of the blade, and the portion 23.'y between the inner edge of the blade and the shaft is sol twisted that its Vinner end is in; line with the axis. lts inner end isprovided with a lug12 which rests in and is secured in recess 183 as abovedescribed,y in connection with stay 5. This stay .extends inward at `right angles to the axis ofthe shaft asl does stay 5. .The rivet or other fastening to the blade preferably vpasses through the outer portion 22^of stay 8. y

It will be seen from the above description widely `separated lon the peripheryv of the shaft as shown on` F ig. 2 form a brace to re-y sist rotary-movement ofthe blade relative tothe shaft, and from the facty that their Fig. 3, they also serve as a brace against any rearward longitudinal movement.y of the blade, the stays 7 and l8 being similarly ar-. ranged as shown in Figs. 2 kand 3 serve to brace the blade against rotary movement. and also `against any 'forward longitudinal movement. The stays and 7 extendingasshown in F ig. 3 in opposite directions and being connected at their outer lends by the. blade serve as theouter members of a truss` the supporting members lof which are the stays 5 and 8, as'shown in Fig. 3.

rlhe blade 2 is preferablyformed of sheet shown is firmly` .and rigidly held in position by the stays whether the rim 3 is used or not.

By reason of thefactk that stays 5,l 6 and i Genies o'f thisipatentmay Jbe obtained for ve 4cents 8 arev all secured to the rear face of the blade, i'

the .front or cuttingface of the'bla-de presents a smooth unbroken surface-to the water yfor nearly its whole extent, the only break inl er end' ofstay 7.*

its surface being the upp which isnear the rear end of the blade.

v `lThe twistingsof the portions of the stays' i 5, 6 and `7 and 8 as above describedvbetween rtheinner edge of` theblade andthe shaft causes them to present ycomparatively(thin edges lto the `water in-` the .centers-portion. of the wheel and thus avoidschurning ofthis {water andy permits the water to pass through Ewith the least possible obstruction.l .By-securing: the innery ends of the staysfasdefscrib'edz'the peripheral l surface of lthe shaft` iisl made as nearly unbroken and 4smooth as gpossible. v

Of course when lthe propeller is operated finreverse direction the rear faces` of the .blades willlbec'orne,` as regards action on'the fwater, 4front faces and as these `faces vare `broken by the outer ends of stays 5, 'and 8 thepropeller will not be as eliicient as when] rotated in the other direction but will still be highly eiiicient. f y, p

Havingthus described my inventionfwhat l claim is; 1. A propeller, having a central 'shaft'and blades extending inward from the periphery a distance less than the length of a radius and stays connected at their outerfendsto a blade and atjtheir inner lends to the shaft;

thestays being arranged in pairs, the-'stays of each pair beingy vsecured together 'near their outer ends -and'havingtheir inneryends 4secured to the isha-ft at points widely separated on its periphery: v

2. A propeller having `a central shaft and vblades extendinginward from the lperiphery a `distance less than the length of a radius land stays connected at their youter vends to a blade and at their innerfendsto the shaft,v

thelstays beingvarranged inpairs, the'stays of each ,pair ybeing .secured together 'near their outer ends andhavlng thelrinner ends secured `to-ithe -shaft at points widely sep-v i i arated onv its peripheryfandqalso widelyv separated longitudinally of its axis;

rfhis specification signed and witnessed this 22nd day of January, 13.51914;A

i GR'IGORY lKOVALVEVIGH. In the presence of-.V i JACOB M. SAs'LAN. .7;

Jon OMBER.

ieach, by addressing Washington, 1).,0.

thel f Commissioner oflatents, 

